import { requireAuth } from "@/lib/jwt";
import { sql } from "@/lib/db";
import { broadcastRequest } from "@/lib/dispatch";
import { isServiceId } from "@/lib/driver";
import { ACTIVE_STATUS_ARRAY } from "@/lib/ride-lifecycle";
import { DEFAULT_SERVICE } from "@/constants/services";

// Explicit missing check — a truthy check would reject legitimate 0 values
// like latitude 0.0 (the equator) or a zero fare.
const isMissing = (v: unknown): boolean => v === undefined || v === null;

// POST — open a ride request.
//
// This fires the moment the rider taps "Find now", before any payment
// decision: the ride is created with status='requested', driver_id=NULL and
// payment_status='pending', then broadcast to every eligible driver near the
// pickup. Drivers volunteer, the rider picks one, and /ride/:id/select is
// where the driver, the payment method and (for card) the paid order all land
// together.
//
// Nothing is charged here, so there is nothing to refund if no driver takes
// it — which is the point of moving payment behind the pick.
export async function POST(request: Request) {
  const auth = requireAuth(request);
  if ("error" in auth) return auth.error;

  try {
    const body = await request.json();
    const {
      origin_address,
      destination_address,
      origin_latitude,
      origin_longitude,
      destination_latitude,
      destination_longitude,
      ride_time,
      fare_price,
      service,
    } = body;

    if (
      isMissing(origin_address) ||
      isMissing(destination_address) ||
      isMissing(origin_latitude) ||
      isMissing(origin_longitude) ||
      isMissing(destination_latitude) ||
      isMissing(destination_longitude) ||
      isMissing(ride_time) ||
      isMissing(fare_price)
    ) {
      return Response.json(
        { error: "Missing required fields" },
        { status: 400 },
      );
    }

    const rideService = isServiceId(service) ? service : DEFAULT_SERVICE;
    const fareCents = Math.round(Number(fare_price));
    if (!Number.isFinite(fareCents) || fareCents <= 0) {
      return Response.json({ error: "Invalid fare." }, { status: 400 });
    }

    // One ride in flight per rider. Without this a rider who backs out of the
    // tracking screen and re-books ends up with two live requests broadcast to
    // the same drivers, who then see the same job twice from one person.
    const inFlight = await sql<{ ride_id: number; status: string }>`
      SELECT ride_id, status FROM rides
      WHERE user_id = ${auth.userId}
        AND status = ANY(${ACTIVE_STATUS_ARRAY}::text[])
      ORDER BY created_at DESC
      LIMIT 1
    `;
    if (inFlight[0]) {
      return Response.json(
        {
          error: "You already have a ride in progress.",
          code: "RIDE_IN_PROGRESS",
          ride_id: inFlight[0].ride_id,
        },
        { status: 409 },
      );
    }

    const response = await sql`
      INSERT INTO rides (
        origin_address,
        destination_address,
        origin_latitude,
        origin_longitude,
        destination_latitude,
        destination_longitude,
        ride_time,
        fare_price,
        payment_status,
        driver_id,
        user_id,
        status,
        service
      ) VALUES (
        ${origin_address},
        ${destination_address},
        ${origin_latitude},
        ${origin_longitude},
        ${destination_latitude},
        ${destination_longitude},
        ${ride_time},
        ${fareCents},
        'pending',
        NULL,
        ${auth.userId},
        'requested',
        ${rideService}
      )
      RETURNING *
    `;

    // Announce it to nearby drivers. Not awaited: the rider's screen should
    // open on "looking for drivers" immediately, and the rider's own status
    // poll re-drives the broadcast if this one loses its race with the push
    // service.
    void broadcastRequest(response[0].ride_id);

    return Response.json({ data: response[0] }, { status: 201 });
  } catch (error) {
    console.error("[CREATE_RIDES]: ", error);
    return Response.json({ error: "Internal Server Error" }, { status: 500 });
  }
}